How do I adjust the number of DNS queries on my Synology NAS?

Question

Domain Name System

There is DNS on the Synology NAS. Registered domain name. All devices on the local network use this DNS. The network has a transmission client on a dedicated virtual machine. When any download is active, DNS stops working normally, which results in a browser message for client hosts "Web page not available. DNS_PROBE_FINISHED_BAD_CONFIG".
NAS CPU is 10% loaded. nslookup from the console falls off on a timeout.
It seems like there is a feeling that the channel is clogged, but the transmission statistics show no more than 1-2MB / s. At 100 Mb / s the channel is unlikely. In addition, if you send clients to the provider's DNS server, then the sites open normally. Although speedtest shows a throughput of 10 megabits.
Where to dig? Maybe DNS has some timeouts for name resolution?

Answer 1

Um ... The
thing is that your NAS is built on a chopped ARM, which does not shine with performance from the word "absolutely".
The transmission client is interesting.
Those. this is an instance of the transmission itself, right? Not a manager, but a torrent client? I suppose it is. And if so, then you feed the DNS servers of Google or someone else to this machine on which the torrent client is running. This will help you.
Further, you can also prohibit all requests from the machine with the torrent client on the side of your DNS server.
I somehow don’t know about timeouts, but in named, which is BIND, you can tweak something by moving your machine with the torrent client to acl, and already apply the rules for this acl. A little more here .